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https://issues.apache.org/jira/browse/HIVE-22239?focusedWorklogId=324946&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-324946
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ASF GitHub Bot logged work on HIVE-22239:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 08/Oct/19 08:47
Start Date: 08/Oct/19 08:47
Worklog Time Spent: 10m
Work Description: kgyrtkirk commented on pull request #787: HIVE-22239
URL: https://github.com/apache/hive/pull/787#discussion_r332353993
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File path:
ql/src/java/org/apache/hadoop/hive/ql/optimizer/stats/annotation/StatsRulesProcFactory.java
##########
@@ -316,7 +321,7 @@ public Object process(Node nd, Stack<Node> stack,
NodeProcessorCtx procCtx,
protected long evaluateExpression(Statistics stats, ExprNodeDesc pred,
AnnotateStatsProcCtx aspCtx, List<String> neededCols,
- Operator<?> op, long currNumRows) throws SemanticException {
+ Operator<?> op, long currNumRows, boolean uniformWithinRange) throws
SemanticException {
Review comment:
this boolean is not used in this function ; but aspCtx can be used to obtain
it - I would suggest to either:
* leave the function signature as is and get the boolean when its needed
from conf
* this class is constructed and used to optimize a single query - so we may
pass the conf on consturction and create a finalized field from this info
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Issue Time Tracking
-------------------
Worklog Id: (was: 324946)
Time Spent: 1h (was: 50m)
> Scale data size using column value ranges
> -----------------------------------------
>
> Key: HIVE-22239
> URL: https://issues.apache.org/jira/browse/HIVE-22239
> Project: Hive
> Issue Type: Improvement
> Components: Physical Optimizer
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-22239.01.patch, HIVE-22239.02.patch,
> HIVE-22239.patch
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Currently, min/max values for columns are only used to determine whether a
> certain range filter falls out of range and thus filters all rows or none at
> all. If it does not, we just use a heuristic that the condition will filter
> 1/3 of the input rows. Instead of using that heuristic, we can use another
> one that assumes that data will be uniformly distributed across that range,
> and calculate the selectivity for the condition accordingly.
> This patch also includes the propagation of min/max column values from
> statistics to the optimizer for timestamp type.
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